Bully Dog Caterpillar® Stage 2 Big Rig Turbo Part# 56845

The Bully Dog Stage 2 Big Rig Turbo (Part #56845) is a high-performance, non-wastegated turbocharger specifically designed for Caterpillar heavy-duty engines manufactured between 1984 and 2004. It is primarily used in Class 8 and 9 semi-trucks, such as those from Kenworth, Peterbilt, Freightliner, and Western Star.

Engine Compatibility

This turbocharger is a direct bolt-on replacement for the following Caterpillar engine models:

• 3406B (14.6L): 1984–2003

• 3406C (14.6L): 1984–2003

• 3406E (14.6L & 15.8L): 1994–2003

• C-15 (14.6L): 1999–2003 (and 2004 Single Turbo non-ACERT models)

• C-16 (15.8L): 1999–2003

It is compatible with engines featuring common serial number prefixes such as 5EK, 6TS, 1LW, 1MM, 6NZ, 7CZ, and MBN.

Performance Specifications

• Horsepower Range: Designed for trucks producing between 600 and 900 HP.

• Turbo Specs: Features an 80mm billet aluminum compressor wheel and a 1.45 A/R exhaust housing.

• Key Benefits: Provides an additional 30–40 horsepower, reduces exhaust gas temperatures (EGTs), and improves fuel economy through a faster-spinning, triple-balanced design.

Installation Note

This part is a direct bolt-on for factory locations and typically includes necessary gaskets. However, for some C15 and C16 applications, a 90-degree intake elbow kit may be required for a perfect fit.